Add ability to filter by author in language tools API

[zbraniecki]

This it the last known issue blocking https://bugzilla.mozilla.org/show_bug.cgi?id=1429610

We need to filter langpacks/dictionaries to only include ones provided by Mozilla RelEng Team when selecting ones to show in Preferences.

aswan says that he's not very opinionated on how to do that - we can probably add an author ID to the query, or get list with authors and filter by it, either should work fine for us.

[diox]

I was hoping to avoid that, it makes the query worse... I guess we still have heavy caching to save us...

[zbraniecki]

I'm sorry to hear it causes issues.

Are language tools APIs used anywhere else? If not, maybe we could just limited them to Mozilla RelEng provided addons?

[diox]

We have no good way of identifying the add-ons besides the author (IIRC their guids vary), and both fetching and filtering that information are an issue because of the way the tables are set up (and the fact that we fetch a lot of add-ons at once in this API).

However with the caching it's probably not entirely terrible, there will be a slight performance loss on cold cache but it should be bearable. I'll look into it and implement what's less worse :)

[zbraniecki]

Thank you!

[diox]

Fix will land on dev shortly and be in next week's tag. It adds support for passing author=mozilla query parameter in the language tools API to filter add-ons where the user with the username mozilla is a listed author.

[AlexandraMoga]

Verified on -dev by sending the following request:

https://addons-dev.allizom.org/api/v4/addons/language-tools/?type=language&app=firefox&author=mozilla

I've looked at some of the results and in all cases Mozilla was listed as author or one of the authors.